1 - Add new instructions such as: setcond, clz, ctz, popcnt.
3 - See if it is worth exporting mul2, mulu2, div2, divu2.
5 - Support of globals saved in fixed registers between TBs.
9 - Move the slow part of the qemu_ld/st ops after the end of the TB.
11 - Change exception syntax to get closer to QOP system (exception
12 parameters given with a specific instruction).
14 - Add float and vector support.